]> git.sur5r.net Git - u-boot/blob - drivers/power/mfd/fg_max77693.c
drivers: move some drivers to drivers/Makefile
[u-boot] / drivers / power / mfd / fg_max77693.c
1 /*
2  * Copyright (C) 2013 Samsung Electronics
3  * Piotr Wilczek <p.wilczek@samsung.com>
4  *
5  * SPDX-License-Identifier:     GPL-2.0+
6  */
7
8 #include <common.h>
9 #include <power/pmic.h>
10 #include <power/max77693_fg.h>
11 #include <i2c.h>
12 #include <power/power_chrg.h>
13 #include <power/battery.h>
14 #include <power/fg_battery_cell_params.h>
15 #include <errno.h>
16
17 static int max77693_get_vcell(u32 *vcell)
18 {
19         u16 value;
20         u8 ret;
21
22         ret = i2c_read(MAX77693_FUEL_I2C_ADDR, MAX77693_VCELL, 1,
23                        (u8 *)&value, 2);
24         if (ret)
25                 return ret;
26
27         *vcell = (u32)(value >> 3);
28         *vcell = *vcell * 625;
29
30         return 0;
31 }
32
33 static int max77693_get_soc(u32 *soc)
34 {
35         u16 value;
36         u8 ret;
37
38         ret = i2c_read(MAX77693_FUEL_I2C_ADDR, MAX77693_VFSOC, 1,
39                        (u8 *)&value, 2);
40         if (ret)
41                 return ret;
42
43         *soc = (u32)(value >> 8);
44
45         return 0;
46 }
47
48 static int power_update_battery(struct pmic *p, struct pmic *bat)
49 {
50         struct power_battery *pb = bat->pbat;
51         int ret;
52
53         if (pmic_probe(p)) {
54                 puts("Can't find max77693 fuel gauge\n");
55                 return -1;
56         }
57
58         ret = max77693_get_soc(&pb->bat->state_of_chrg);
59         if (ret)
60                 return ret;
61
62         max77693_get_vcell(&pb->bat->voltage_uV);
63         if (ret)
64                 return ret;
65
66         return 0;
67 }
68
69 static int power_check_battery(struct pmic *p, struct pmic *bat)
70 {
71         struct power_battery *pb = bat->pbat;
72         unsigned int val;
73         int ret = 0;
74
75         if (pmic_probe(p)) {
76                 puts("Can't find max77693 fuel gauge\n");
77                 return -1;
78         }
79
80         ret = pmic_reg_read(p, MAX77693_STATUS, &val);
81         if (ret)
82                 return ret;
83         debug("fg status: 0x%x\n", val);
84
85         ret = pmic_reg_read(p, MAX77693_VERSION, &pb->bat->version);
86         if (ret)
87                 return ret;
88
89         ret = power_update_battery(p, bat);
90         if (ret)
91                 return ret;
92         debug("fg ver: 0x%x\n", pb->bat->version);
93         printf("BAT: state_of_charge(SOC):%d%%\n",
94                pb->bat->state_of_chrg);
95
96         printf("     voltage: %d.%6.6d [V] (expected to be %d [mAh])\n",
97                pb->bat->voltage_uV / 1000000,
98                pb->bat->voltage_uV % 1000000,
99                pb->bat->capacity);
100
101         if (pb->bat->voltage_uV > 3850000)
102                 pb->bat->state = EXT_SOURCE;
103         else if (pb->bat->voltage_uV < 3600000 || pb->bat->state_of_chrg < 5)
104                 pb->bat->state = CHARGE;
105         else
106                 pb->bat->state = NORMAL;
107
108         return 0;
109 }
110
111 static struct power_fg power_fg_ops = {
112         .fg_battery_check = power_check_battery,
113         .fg_battery_update = power_update_battery,
114 };
115
116 int power_fg_init(unsigned char bus)
117 {
118         static const char name[] = "MAX77693_FG";
119         struct pmic *p = pmic_alloc();
120
121         if (!p) {
122                 printf("%s: POWER allocation error!\n", __func__);
123                 return -ENOMEM;
124         }
125
126         debug("Board Fuel Gauge init\n");
127
128         p->name = name;
129         p->interface = PMIC_I2C;
130         p->number_of_regs = FG_NUM_OF_REGS;
131         p->hw.i2c.addr = MAX77693_FUEL_I2C_ADDR;
132         p->hw.i2c.tx_num = 2;
133         p->sensor_byte_order = PMIC_SENSOR_BYTE_ORDER_BIG;
134         p->bus = bus;
135
136         p->fg = &power_fg_ops;
137
138         return 0;
139 }